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Old 09-30-2003, 12:49 PM
Duke2.6 Duke2.6 is offline
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Join Date: Mar 2003
Location: Southern California
Posts: 2,055
When the temp hits 100C and the thermo clutch on the fan tightens (or the electromagnetic fan clutch engages on some engines) you will hear "fan roar" at over 2-3000 RPM, which is normal.

Also, four-cylinder engines are noisier than sixes because their unbalanced second order vertical shaking force can produce a low frequency audible noise at medium to high revs.

If this noise is something new, I would verify proper operation of the fan and have the motor mounts inspected by a competent Mercedes tech.

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